The environmental choice for outdoor building!

For over forty years consumers have been turning to Great Southern Wood for the best pressure treated lumber products available. They know that for the best protection against rot, fungal decay and termite attack all they need to look for is the little “yella tag.” It represents quality, and they know it means their project will withstand the weather season after season. Here’s why:

  • Treated with a wood treatment process that has earned a number of environmental certifications.
  • Durable and designed for outdoor construction.
  • Lifetime Residential and Agricultural Limited Warranty against structural damage caused by fungal decay and termites for above ground, ground contact and fresh water contact applications. See warranty for specific provisions.
  • Limited 15 Year Warranty for Fence Boards. See warranty for specific provisions.
  • Use for many different building projects such as fences, structural lumber, sill plates, outdoor furniture, patios, decks, garden edging, and landscaping structures.
  • Building code compliant. ICC-ES Reports, ESR-2240, ESR-1721.
  • Copper-based preservative with a co-biocide.
Characteristics of the Micronized Copper Preservative
Consumers have fallen in love with the lighter, more natural appearance of micronized copper treated products as well as their improved painting and staining capabilities. But YellaWood® brand products also boast improved corrosion characteristics and are approved for contact with aluminum*. In addition, they are long-lasting, durable, clean to the touch, have no objectionable odor, and provide protection from rot, fungal decay and termite attack. Outdoor exposure testing shows that products treated with micronized copper preservatives offer superior product benefits compared to other copper-based wood preservatives.

YellaWood® brand products are available in Southern Yellow Pine and South American Pine species and are available treated for Above Ground, Above Ground General Use, Ground Contact and Fresh Water Immersion applications. The preservatives used in the treatment process are registered by the EPA as a non-restricted use pesticide and do not require Proposition 65 labeling in California. Products treated with micronized copper preservatives, such as YellaWood® brand products, as described in ESR-2240 and ESR-1721 are building code compliant.

Specialty Treatments
YellaWood® brand products are also available with built-in water repellents for extra protection from the elements. The factory-applied water repellent provides protection to all four sides of the board including those sides typically missed by a brush or spray-on repellent applied after installation. This gives consumers long-term performance and minimizes cracking, warping and twisting due to swelling and shrinking from weather cycles.

Weathering Information
Thanks to a unique treating process, consumers can enjoy wood the way Mother Nature intended; meaning, no more dark-green tint to wood. It is important to pay attention to the end tags to make sure the desired treatment is indicated since freshly treated micronized copper products will appear only slightly greener than untreated wood. Over time, they will weather to a honey brown and then to a familiar, and often desired, gray.

Warranty Information
A Lifetime Residential and Agricultural Limited Warranty is offered on YellaWood® brand products for Above Ground, Ground Contact and Fresh Water Contact, used in residential and agricultural applications. Click here for specific warranty provisions.

A Limited 15 Year Warranty is offered on YellaWood® brand fence boards. Click here for specific warranty provisions.

Fastener Information
YellaWood® brand pressure treated pine exhibits corrosion rates on metal products similar to CCA pressure treated wood and untreated wood.

  • For interior or exterior applications - Use fasteners and hardware that are in compliance with the manufacturer’s recommendations and the building codes for their intended use.  As with any good design and construction practices, micronized copper treated wood should not be used in applications where trapped moisture or water can occur.  Where design and/or actual conditions allow for constant, repetitive or long periods of wet conditions, only stainless steel fasteners should be used.
  • For exterior applications - The following galvanization levels may be used for connectors, joist hangers, fasteners and other hardware that are placed in direct contact with exterior applications of micronized copper treated wood:

    Fasteners - nails, screws, etc. ASTM - A 153 (1 oz./ft²)

    Hardware - connectors, joist hangers, etc. ASTM - A 653 G90 (0.90 oz./ft²)

    The effects of other building materials within a given assembly, along with environmental factors, should also be considered when selecting the appropriate hardware and fasteners to use for a given project containing treated wood.

    Stainless Steel fasteners and hardware are required for Permanent Wood Foundations below grade and are recommended for use with treated wood in other severe exterior applications such as swimming pools, salt water exposure, etc. - Type 304 and 316 are recommended grades to use.
Contact with Aluminum
Aluminum building products may be placed in direct contact with YellaWood® brand products treated with micronized copper preservatives used for interior uses and above ground exterior applications such as decks, fencing, and landscaping projects. Examples of aluminum products include siding, roofing, gutters, door and window trim, flashing, nails, fasteners and other hardware connectors. However, direct contact of micronized copper treated products with aluminum building products should be limited to code-compliant construction applications that provide proper water drainage and do not allow the wood to be exposed to standing water or water immersion.

We recommend you contact the aluminum building products manufacturer for its recommendations regarding use of its aluminum products in contact with micronized copper treated wood in ground contact applications or when exposed to salt water, brackish water, or chlorinated water, such as swimming pools or hot tubs.

Also check with the aluminum building products manufacturer regarding compatibility with other chemicals and cleaning agents. Contact Osmose for further information on aluminum contact use in commercial, industrial, and specialty applications such as boat construction.

Coveted Environmental Certification
Following an exhaustive study by Scientific Certification Systems (SCS), a leader in green-building product certification since 1990, the wood preservative process used to treat YellaWood® brand products has received the coveted Environmentally Preferable Product (EPP) certification based on Life-Cycle Assessment. Isn’t it nice to know that when you build with YellaWood® brand products, you’re getting not only the best protection against rot, fungal decay and termite attack, but also a product that is treated with a preservative that is SCS certified as an Environmentally Preferable Product?




Micronized Copper Snapshot

  • Treatment Type: Micronized copper azole
  • Environmental Certification of the Treatment Process: Environmentally Preferable Product certification by Scientific Certification Systems based on Life-Cycle Assessment
  • Protection From Rot, Fungal Decay and Termite Attack: Yes
  • Fence Warranty: Limited 15 Year
  • Above Ground Warranty: Lifetime Residential & Agricultural Limited
  • Ground Contact/Fresh Water Contact Warranty: Lifetime Residential & Agricultural Limited
  • Paintable/Stainable: Yes
  • Color Pigments: a cedar tone for a look similar to cedar products or a brown tone for a look similar to redwood products
  • ESR: #2240 and #1721
  • EPA Registered: Yes
  • Building Code Compliant: Yes
  • Corrosion Characteristics: Similar to CCA treated and untreated wood
  • Aluminum Contact: Yes




Important Information
  • Consult the end tag to determine which preservative or preservative system was used in the treatment of that particular product. Micronized copper treated products may be used in direct contact with aluminum building products when limited to code-compliant construction applications that provide proper water drainage and do not allow the wood to be exposed to standing water or water immersion.
  • Use fasteners and other hardware that are in compliance with building codes for the intended use with micronized copper treated products.
  • Do not burn preserved wood.
  • Wear a dust mask and goggles when cutting or sanding wood.
  • Wear gloves when working with wood.
  • Some preservative may migrate from the treated wood into soil/water or may dislodge from the treated wood surface upon contact with skin.
  • Wash exposed skin areas thoroughly.
  • All sawdust and construction debris should be cleaned up and disposed of after construction.
  • Wash work clothes separately from other household clothing before reuse.
  • Preserved wood should not be used where it may come into direct or indirect contact with drinking water, except for uses involving incidental contact such as fresh water docks and bridges.
  • Do not use preserved wood under circumstances when the preservative may become a component of food, animal feed or beehives.
  • Do not use preserved wood as mulch.
  • Only preserved wood that is visibly clean and free of surface residue should be used.
  • If the wood is to be used in an interior application and becomes wet during construction, it should be allowed to dry before being covered or enclosed.
  • If you desire to apply a paint, stain, clear water repellent or other finish to your preservative-treated wood, we recommend following the manufacturer’s instructions and label of the finishing product. Before you start, we recommend you apply the finishing product to a small exposed test area before finishing the entire project to ensure it provides the intended result before proceeding.
  • Mold growth can and does occur on the surface of many products, including untreated and treated wood, during prolonged surface exposure to excessive moisture conditions. To remove mold from the treated wood surface, wood should be allowed to dry. Typically, mild soap and water can be used to remove remaining surface mold. For more information visit www.epa.gov.
  • Projects should be designed and installed in accordance with federal, state and local building codes and ordinances governing construction in your area, and in accordance with the National Design Specifications® (NDS®) and the Wood Handbook.

Disposal Recommendations:
Preserved wood may be disposed of in landfills or burned in commercial or industrial incinerators or boilers in accordance with federal, state and local regulations.

Note: Electroplated galvanized fasteners and metal products are typically not accepted by the building codes for use in exterior applications, regardless of the type of wood used.

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